Level 0 DFD (context diagram)

Diagram

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Definition

An overview of the whole system as one process; it does not show data stores or internal processes, only external entities and data flows.

Example: One circle: Library system with Member and Librarian.

Found in: course specifications, school notes.

Where you'll use it in the test

Syllabus area: Diagrams and tools.

Question types it can appear in

Drawing: Draw or label it in the online drawing tool.
Short answer: Define, outline or explain it and tie it to the scenario.
Multiple choice: Pick the option that matches the definition or example.

Where it has appeared in the paper

The Software Engineering Project (Part D). Part letters follow each paper’s own layout.

How to use it

A model sentence

General advice, built from the definition and example above

Diagram: “An overview of the whole system as one process; it does not show data stores or internal processes, only external entities and data flows.” Then apply it: One circle: Library system with Member and Librarian.

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Command words used with it

General advice

No linked question shows the command word for this term. Across the past drawing and short answer questions in this bank the words used most are: Explain, Outline, Describe, Compare, Classify, Analyse. Check the actual word in your question.

Go deeper

Flashcard: Level 0 DFD (context diagram) in Diagrams and Modelling Tools (Years 11 and 12) · study that set
Memorise: Drawing rules: DFD, structure chart, storyboard, decision tree, class diagram, ERD
Notes: Modelling tools: DFD, structure charts, storyboards, flowcharts, class diagrams (The Software Engineering Project (Year 12))
Full term page: every question, note and marking comment for Level 0 DFD (context diagram)

Check yourself

Describe or sketch “Level 0 DFD (context diagram)”: what it shows, its parts and when you would use it.

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